added running kontor-javalin with example API

kontor-javalin/src/main/java/de/thpeetz/kontor/api/Main.java

@@ -0,0 +1,29 @@
+package de.thpeetz.kontor.api;
+
+import de.thpeetz.kontor.services.inmemory.InMemoryPersonReader;
+import io.javalin.Javalin;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class Main {
+    private static Logger logger = LoggerFactory.getLogger(Main.class);
+    private static short port = 8400;
+
+    public static void main(String[] args) {
+        var personReader = new InMemoryPersonReader();
+        var objMapper = new ObjectMapper();
+        var result = objMapper.valueToTree(personReader.getAll());
+
+        logger.info("API: found {} people.", personReader.getAll().size());
+
+        var app = Javalin.create().start(port);
+        app.get("/ping", ctx -> ctx.result("pong"));
+        app.get("/persons", ctx -> {
+            logger.info("persons called");
+            ctx.json(result);
+        });
+
+        logger.info("API's alive for real :-)))");
+    }
+}

kontor-javalin/src/main/java/de/thpeetz/kontor/models/Person.java

@@ -0,0 +1,27 @@
+package de.thpeetz.kontor.models;
+
+public class Person {
+    private String name;
+    private int age;
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+}

kontor-javalin/src/main/java/de/thpeetz/kontor/services/api/PersonReader.java

@@ -0,0 +1,8 @@
+package de.thpeetz.kontor.services.api;
+
+import de.thpeetz.kontor.models.Person;
+import java.util.List;
+
+public interface PersonReader {
+    List<Person> getAll();
+}

kontor-javalin/src/main/java/de/thpeetz/kontor/services/inmemory/InMemoryPersonReader.java

@@ -0,0 +1,16 @@
+package de.thpeetz.kontor.services.inmemory;
+
+import de.thpeetz.kontor.models.Person;
+import java.util.List;
+
+import de.thpeetz.kontor.services.api.PersonReader;
+
+public class InMemoryPersonReader implements PersonReader {
+
+    @Override
+    public List<Person> getAll() {
+        return List.of(
+                new Person("Vincent Vega", 73),
+                new Person("Jules Winnfield", 12));
+    }
+}